Room Air Conditioners…

I have a plug in electrical tester that indicates correct wiring, when plugged into most outlets the left two yellow lights are lit, however I have this one round outlet for a 20 amp circuit for an airconditioner, when I plug it in all three lights are lit

Hey, check out these auctions:

Frigidaire FAA065P7A Window Air Conditioner NEW!

US $174.99 End Date: Monday Feb-08-2010 4:13:38 PST Buy It Now for only: US $174.99 Buy it now | Add to watch list

L G , 8000 BTU WINDOW AIR CONDITIONER,MODEL; LWHD8000R

US $55.00 (0 Bid) End Date: Monday Feb-08-2010 4:56:56 PST Buy It Now for only: US $70.00 Bid now | Buy it now | Add to watch list

Yellow Jacket Air Conditioner Tester

US $12.00 (0 Bid) End Date: Monday Feb-08-2010 5:36:34 PST Bid now | Add to watch list

Cool, arent they?